Watched the video.
What a strange demo rifle!...carbine length barrel/gas, bulky stock, magnified scope mounted on top of a carry handle (probably 5" above the barrel), with a light, bipod/foregrip, and extra mag attached. A mall ninja's dream come true! So a buttload of cluttered extra weight in an overall setup that makes little sense to me, and the recoil seemed...typical.
Combine a good stock (Magpul STR maybe), with an M16 BCG and midlength gas. That'll make for a tame recoil by itself. Maybe add an aftermarket muzzle device if you want more than that.
If that doesn't do it, it's time to load up (err...down) some weak ammo or buy a S&W 15-22.